/*
 *  Axolotl - Alternate persistence for Grails
 *  Copyright (C) 2008  Juanjo García Latre
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package com.googlecode.axolotl.query;


/**
 * Visitor pattern for query trees.
 * 
 * @author juanjo
 * @param <R> result type of the visit.
 */
public interface QueryVisitor<R> {

	R visit(PropertyName p);
	R visit(And and);
	R visit(Or or);
	R visit(Equals e);
	R visit(GreaterOrEqual ge);
	R visit(LessOrEqual le);
	R visit(Between b);
	R visit(Like l);
	R visit(In in);
	R visit(Order r);
	R visit(Query q);
}
